Correct Option: B

The Salt Satyagraha started on March 12, 1930, with the undertaking of the Dandi Yatra (Dandi March). It was the next significant non-violent protest against the British, after the Non-Cooperation movement of 1920-22 and India’s First War of Independence 1857. The triggering factor for this movement was the British monopoly of salt trade in India and the imposition of a salt tax.